The latest Marquette University Law School poll found a tightening in Wisconsin’s U.S. Senate race, but the President Obama maintaining a substantial lead over Mitt Romney.
The survey found Obama backed by 53 percent of respondents, while 42 percent supported Romney. The Marquette poll conducted two weeks earlier had Obama up 54-40.
In the Senate race, Dem Tammy Baldwin led Republican Tommy Thompson 48-44 compared to a 50-41 lead for Baldwin two weeks earlier.
In both cases, shifts among independents accounted for the differences in the results from mid-September and those from the end of the month, said pollster Charles Franklin.
In the presidential race, Obama led among independents 53-38 in mid-September, but was up 49-40 at the end of September. In the Senate race, Baldwin had a 12-point lead among independents in mid-September, but both candidates were tied at 43 percent in the latter survey.
The partisan breakdown of the sample of likely voters was 34 percent Dems, 28 percent Republicans and 36 percent independents. Last month, it was 34-27 with 37 percent identifying themselves as independents.
The survey of 1,000 registered voters, of which 894 respondents said they are likely to vote this November, was conducted Sept. 27-30. Respondents were polled using live interview of both landlines and cell phones. The margin of error for the overall sample was plus or minus 3.2 percentage points. For likely voters, it was plus or minus 3.3 percentage points. The head-to-head matchups were based off the sample of likely voters.
Franklin said he will release two more polls before the election.